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a 4.5kg dog stands on an 18 kg flatboat at distance D=6.1m from the shore. It walks 2.4m along the boat toward shore and the nstops Assuming no friction between the boat and the water, find how far the dog is then from the shore
Find the total number of lines in a 2.90 wide diffraction grating whose third-order spectrum has the 640 hydrogen- spectral line at an angular position of 39.0.
It explodes on a mountainside 36.0 s after firing. Illustrate what are the x and y components of the shell where it explodes, relative to its firing point?
Michael Phelps won a gold medal at the 2008 Beijiing olympics by swimming the 200 meter medley in 1:54:80. On an off-day Mike swims the medley in 1:58:32. What is the speed in mph? (Give the ans. to two decimal places)
In a non-uniform gas, the equation of state is valid locally, as long as the density does not change too rapidly with position. Consider a column of ideal gas under gravity at constant temperature. Find the density as a function of height, by bala..
Hakeem throws a 10.50 g ball straight down from a height of 2m. The ball strikes the floor at a speed of 7m/s. What was the initial speed of the ball? Presume that air resistance is negligible.
What is the stopping distance of the car, as measured from the point where the driver first notices the red light?
What minimum coefficient of static friction is required? Is the reply you found reasonable? In other words, is he probable to stay on the merry-go-round.
A force vector points at an angle of 50.6° above the +x axis. It has a y component of +280 newtons. Calculate the magnitude of the force vector.
What is the maximum amount of energy the incident electron can lose in elastically in this collision? What is left over energy of the electron.
A proton is initially at rest at a point where the potential is 515V. Sometime later the proton is at a point where the potential is 190V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
A string of 13 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 63 W. What is the comparable resistance of light string.
Two trains and a bird Two trains, each having a speed of 23km/h, are headed at each other on the equal straight track. A bird that can fly 60km/h flies off the front of one train when they are 70 km apart and heads directly for the other train.
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